Quality assurance of the proposed method, comparing with the method reported by Amer et al. (2013).

Compound	Validation according to the Amer et al. (2013) method49			This work
	Linear range (μg L−1)	R 2	LOD (μg L−1)	Linear range (μg L−1)	R 2	LOD (μg L−1)
PAME	500.0–50 000	0.992	166.0	0.03–500	0.997	0.06
SAME	500.0–50 000	0.995	200.0	0.03–500	0.996	0.06
OAME	500.0–50 000	0.993	250.0	0.03–500	0.996	0.03
LAME	500.0–50 000	0.995	250.0	0.03–500	0.997	0.05